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Author Topic:   Ballast addition
340duster
Dirt Full Roller

Total posts: 70
posted May 07, 2002 01:03 AM
I have a few questions on rear ballast addition on a rear leaf car.
1) Without any ballast I am at 46% rear weight. I have added ballst to get me to 48% and I am at the minimum class weight. Should I keep going to get to 50% or 52%(it would require another 120-150lbs to obtain 50).
2) Do I put the ballast as high as possible above the diff or low and how will the handling change with ballast height
Thanks for any input

RangeRover
Dirt Maniac

Total posts: 174
posted May 07, 2002 08:07 AM
Some may disagree, but this is how we do it (and win regularly). On the scales, add weight until you are safely legal, but not much overweight. Now you know how much weight you have to play with for ballast. Be aware that 100 lbs over the rear axle will give you less rear percent than those same 100 lbs mounted on or near the rear bumper at the tail end of the car. This fact will give you the means for adding more rear percent without adding more weight. It is preferrable to keep the weight that you can above or just in front of the rear axle, but don't be afraid to start moving ballast rearward to achieve a working rear percentage.

Also, don't forget to remove weight from the front of the car; look carefully, there are usually places where you could lose front weight. That's the best way to gain rear percentage- no added weight.


Deek
Dirt Full Roller

Total posts: 45
posted May 07, 2002 08:28 AM
If you're running a Duster like your handle indicates I'd recommend adding weight until you get up to 53 percent rear. I've ran Dusters for several years and they work well provided your rear percentage is up to that point. What size torsion bars do you have up front?

WesternAuto17
Dirt Freak

Total posts: 248
posted May 07, 2002 01:26 PM
While it is true that moving weight closer to the rear will improove the percentage, remember the same leverage which makes that possible will loosen the car up. Not that that is neccissarily an evil thing, just keep it in mind.

I had a used car I bought and it drove a ton better when I removed the weight from the trunk.

340duster
Dirt Full Roller

Total posts: 70
posted May 07, 2002 01:35 PM
I am running a duster as my handle indicates. I get the t-bar size tonight. They are MP bars and are the next size larger than the big block dart ones. Other suspension items are the MP dirt track #14 and #15 rear leafs and have added a partial leaf to increase stifness. I am currently running the carerra adjustable shocks but plan to switch to the monroe race shocks (SSG121's) soon, as the rules have opened up to allow race shocks and weight jacks. Any other mopar tips/set-ups etc would be helpfull as this is only my second year of running this car. It is turning fairly good now but I want to make it faster.

As far as removing front weight, that is in the works, we are now allowed aluminum intakes and headers. I installed the intake and the headers will be in after the next race. I am also looking for other things I can remove or make out of aluminum.

340duster
Dirt Full Roller

Total posts: 70
posted May 07, 2002 11:57 PM
tbars are 1.040" diam.

Deek
Dirt Full Roller

Total posts: 45
posted May 08, 2002 08:53 AM
You're on the right track, those are the correct torsion bars to use. You have to get the rear weight percentage up like I said earlier. Dusters have the engine sitting horribly far up front and there's not a heck of a lot you can do about it without some major work that usually involves breaking the rules.

Headers are a tough proposition on a Mopar A body as well, as there's very little room on the driver's side with power steering, shifting linkage, the torsion bar, etc. I run the new Dodge truck Magnum exhaust manifolds and have to raise the engine two inches for them to fit. If you're gonna use headers, consider Tube Technogoly Incorportated (TTI). They're pricey, though.

Don't be discouraged by the army of Chevy guys who say your Dodge wont work. It will. I own a Camaro and a Duster street stock. The Camaro has a built 406 and the Dodge is every bit as fast with a 360.

340duster
Dirt Full Roller

Total posts: 70
posted May 08, 2002 11:15 AM
Deek - are you running a 360 magnum engine? or the old type. I put a 97 360 magnum engine in the car with a hughes engines cam and it has way more power than the 340 that I started with. In fact I won the feature race on the first race day with it.

Deek
Dirt Full Roller

Total posts: 45
posted May 09, 2002 08:32 AM
I have two of the old style 360s running J heads. Both around 12 to 1. One has a hydraulic cam and the other has a solid. The engine with the smaller hydraulic cam actually works better in the the car than the bigger motor. I've considered swapping over to the magnum heads from time-to-time, but I've always ended up having to the use the money on something else. Glad to hear that they work well...I might reconsider trying them.

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